So I'd say your spread is good. I usually refer to ppfd but when new growers have light issues I will refer to lux because of the free apps that can somewhat measure it decently enough for our use. Even that is only a ballpark and to get an idea of where they are at.
Tbh I hate numbers and think to many look at guides as absolutes which is very far from being the case.
When it comes to light while yes genetics play a role in how much they can tolerate almost all of the time there is an issue where you see light stress it's not once been due to genetics that I have seen.
Many miss the fact that the environmental factors have probably the biggest impact on how efficiently a plant can use this light (photosynthesis rates) and how much it can tolerate before showing signs of stress or damage. So you cannot just go by guides. Most guides are assuming a relatively healthy plant in a favorable environment and this is often not the case. If they are relatively healthy and in a good environment then you can easily judge the plants reaction to the intensity by paying attention to the upper leaves.
Nice flat or ever so slight V to them is where you want to be. Once they start to V and the plants are lifting the petiole to reduce the exposure of light to the leaf.... you have gone to far and if left will cause issues.
You will see plants with issues and sometimes ppl say oh that amount of light is fine.... well yes it's fine for a health plant but not fine for the plant in question.
The closest thing to a rule in cannabis I can think of is if the plant had an issue reduce the light intensity if possible until corrected. Light is the driving factor of the entire plant... the more light, the higher demand on transpiration, nutrients, co2, water, o2 in the rootzone and the list goes on.
So when you have an issue with one of those and you reduce the demand on whatever the issue is it will progress slower and give you more to correct with much less damage in the time it takes to correct.... which means a much faster recovery and in a lot of cases a lot more leaves with the ability to still photosynthesize and produce energy to the plant.
You can have clones from the same mother go to 2 different grows and literally have one handle much much more light than the other just based on environment and overall health. So numbers are guides and only guides.... reading the plant you cannot go wrong. And yes you can have to much light for a plant in its conditions so just because the numbers should be ok for the plant doesn't mean they are.
Ok last thing on this novel of an answer....
When it comes to light.... it is all about overall photosynthesis not how a particular brach or leaf. So keeping all the leaves exposed to light healthy is important... many cook the top few trying to get more light to the lower ones.... but this will just reduce overall photosynthesis. Likewise why I prune based on maximizing the higher photosynthetic rates of newer growth and removing the oldest largest fan leaves as they are less efficient and take up more space that's exposed to light... now with that said I don't remove any healthy leaves that would allow light to travel through the plant.
Dam I'll stop there but I could prob go on for pages lol.
Tldr: scroll back up and read
Happy belated birthday btw!
